On Tue, 3 Jul 2012, Lukas Czerner wrote:
> Date: Tue, 3 Jul 2012 21:10:42 +0200
> From: Lukas Czerner <lczerner@xxxxxxxxxx>
> To: linux-ext4@xxxxxxxxxxxxxxx
> Cc: tytso@xxxxxxx, Lukas Czerner <lczerner@xxxxxxxxxx>
> Subject: [PATCH] ext4: enable FITRIM ioctl on bigalloc file system
>
> With a minor tweaks regarding minimum extent size to discard and
> discarded bytes reporting the FITRIM can be enabled on bigalloc file
> system and it works without any problem.
>
> This patch fixes minlen handling and discarded bytes reporting to
> take into consideration bigalloc enabled file systems and finally
> removes the restriction and allow FITRIM to be used on file system with
> bigalloc feature enabled.
any comments on this ?
Thanks!
-Lukas
>
> Signed-off-by: Lukas Czerner <lczerner@xxxxxxxxxx>
> ---
> fs/ext4/ioctl.c | 7 -------
> fs/ext4/mballoc.c | 5 +++--
> 2 files changed, 3 insertions(+), 9 deletions(-)
>
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index e34deac..9d6e0bc 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -420,13 +420,6 @@ resizefs_out:
> if (!blk_queue_discard(q))
> return -EOPNOTSUPP;
>
> - if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
> - EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
> - ext4_msg(sb, KERN_ERR,
> - "FITRIM not supported with bigalloc");
> - return -EOPNOTSUPP;
> - }
> -
> if (copy_from_user(&range, (struct fstrim_range __user *)arg,
> sizeof(range)))
> return -EFAULT;
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 1cd6994..c4bd0a6 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -4984,7 +4984,8 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
>
> start = range->start >> sb->s_blocksize_bits;
> end = start + (range->len >> sb->s_blocksize_bits) - 1;
> - minlen = range->minlen >> sb->s_blocksize_bits;
> + minlen = EXT4_NUM_B2C(EXT4_SB(sb),
> + range->minlen >> sb->s_blocksize_bits);
>
> if (unlikely(minlen > EXT4_CLUSTERS_PER_GROUP(sb)) ||
> unlikely(start >= max_blks))
> @@ -5044,6 +5045,6 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
> atomic_set(&EXT4_SB(sb)->s_last_trim_minblks, minlen);
>
> out:
> - range->len = trimmed * sb->s_blocksize;
> + range->len = EXT4_C2B(EXT4_SB(sb), trimmed) << sb->s_blocksize_bits;
> return ret;
> }
>
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